In recent years, Austrian Federal Railways (ÖBB) invested significantly in infrastructure augmentations. Quadrupling of the Vienna - Linz line is almost complete and St Pölten bypass line will open in December 2017. Semmering Base Tunnel (27 Km) and Koralm Tunnel (33 Km) are under construction, while new line from Graz to Koralm tunnel is under progress. In Carinthia, construction is under way on eastern section of Koralm Line from the tunnel to Klagenfurt. Building construction industry in Graz is expected to record a CAGR of 1.9% to reach US$ 1,713.1 million by 2021, while in volume terms, it is expected to record a CAGR of 0.7% during the same period.